Improvement in car-springs



C. FRENCH.

Oar and other Springs. No. 101,724. Patented April l2, 14.870.

N (ETERS. PHOTO-LITHOGRAPMER. WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

CARLOS FRENCH, OF SEYMOUR, CONNECTICUT.

IMPROVEMENT IN CAR-SPRINGS.

Specification forming part of Letters Patent No. 101,724. dated April 12, 1870. v

To all whom it may concern Beit known that I, CARLOS FRENCH, ot' Seymour, in the county of New. Haven and State of Connecticut, have invented a new and useful Improvement in Springs for Cars and otherPurposes; and I do hereby declare that the followin g is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specication, in which- Figure l represents a perspective View of one of the springs in question, and Fig. 2 represents an elevation of the same.

Corrugated plates, disks, and rings have been used in many forms to give a sort of elliptic character to the spring. I lay no claim to any of these things.

My invention consists in a spiroelliptical spring wound from a strip over a mandrel and bent or shaped so that at points in its spiral line it shall assume its elliptic form or character, and at other points come together or abut each other, so as to form a series ot"v curved ellipses in the wound pile.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawlngs.

The spring shown in the drawings at A is made of two strips, a a, welded together at their ends b b, but not united by welding elsewhere.

These strips, so welded, constitute, as it were, a single strip, and are wound around a mandrel in a spiral form; but at intervals, as at c c, the strips are bent one in one direction, the other in a contrary direction, so as to make an elliptic space, c, between them. Where the strips come t0gether,'as t t, they form supports for each other. So that the ellipses and the spirals follow each other in succession from one end ofthe spring to the other, and making it a truly spiro-elliptical spring, certainly so far as the functions of such springs go.

The spring can be madeot' a single strip instead ot' two strips united into one, the proper bends being given to the strip before it is wound on the mandrel or former. With the double or rather united strips the elliptic bends may be put in in the act of winding the strip. Either way. will answer. I prefer the plan herein shown.

Having thus fully described my invention, what I claim therein as new, and desire to secure by Letters Patent, is-

A coiled or spiral spring wound from a strip, and having elliptical spaces formed in the line ofits coil, substantially as and for the purpose described.

CARLOS FRENCH. Witnesses:

A. B. SToUGH'roN, EDMUND MAssoN. 

